﻿218 
  PROCEEDINGS 
  OF 
  THE 
  GEOLOGICAL 
  SOCIETY. 
  [Mar. 
  9, 
  

  

  in 
  North 
  Illinois. 
  Both 
  Dr. 
  F. 
  Eoemer 
  and 
  Dr. 
  B. 
  F. 
  Shumard* 
  found 
  

   on 
  the 
  River 
  San 
  Saba, 
  in 
  Texas, 
  Carboniferous 
  Limestone 
  lying 
  con- 
  

   formably 
  on 
  Lower 
  Silurian 
  (Bird's-eye 
  Limestone), 
  and 
  the 
  latter 
  

   geologist 
  saw 
  it 
  under 
  the 
  same 
  circumstances 
  in 
  the 
  Black 
  Hills 
  

   of 
  the 
  Upper 
  Missouri. 
  In 
  the 
  Upper 
  Mississippi 
  Valley 
  t 
  Coal-mea- 
  

   sures 
  successively 
  overlap 
  the 
  inclined 
  edges 
  of 
  the 
  subjacent 
  rocks, 
  

   from 
  Carboniferous 
  Limestone 
  to 
  Lower 
  Silurian 
  — 
  a 
  fact 
  which 
  has 
  

   several 
  points 
  of 
  interest. 
  Mr. 
  Lesley 
  J 
  gives 
  an 
  instance 
  at 
  Arisaig, 
  

   in 
  Nova 
  Scotia, 
  of 
  Coal-measures 
  unconformable 
  on 
  the 
  Clinton 
  

   group 
  (Upper 
  Silurian). 
  It 
  is 
  stated 
  by 
  Prof. 
  Haughton 
  § 
  that 
  on 
  the 
  

   west 
  coast 
  of 
  King 
  William's 
  Island, 
  in 
  the 
  Arctic 
  seas 
  of 
  America, 
  

   extensive 
  beds 
  of 
  Carboniferous 
  sandstone, 
  with 
  bituminous 
  coal, 
  

   capped 
  by 
  blue 
  limestone 
  of 
  the 
  same 
  period 
  (?), 
  rest 
  horizontally 
  

   and 
  conformably 
  upon 
  Upper 
  Silurian. 
  

  

  Prof. 
  Edward 
  Forbes 
  || 
  relates 
  that, 
  in 
  the 
  north 
  of 
  England, 
  Car- 
  

   boniferous 
  Limestone 
  lies 
  on 
  highly 
  inclined 
  Silurian 
  strata, 
  the 
  former 
  

   being 
  nearly 
  horizontal. 
  In 
  South 
  Staffordshire 
  the 
  Coal-measures 
  

   usually 
  lie 
  directly 
  upon 
  Upper 
  Silurian 
  shale, 
  &c, 
  according 
  to 
  

   Mr. 
  Jukes 
  ^[ 
  and 
  others, 
  in 
  the 
  midst 
  of 
  great 
  denudation 
  ; 
  and 
  Mr. 
  

   Godwin-Austen 
  extends 
  this 
  statement 
  to 
  "Wire 
  and 
  Charnwood 
  

   Forests, 
  as 
  well 
  as 
  to 
  Coalbrook 
  Dale 
  **. 
  

  

  On 
  the 
  River 
  Jezem, 
  in 
  the 
  Oural, 
  Carboniferous 
  Limestone 
  re- 
  

   poses 
  concordantly 
  on 
  Silurian 
  masses 
  ft- 
  

  

  In 
  the 
  foot-note 
  it 
  are 
  placed 
  references 
  to 
  many 
  cases 
  of 
  Car- 
  

   bonifero- 
  Silurian 
  blanks. 
  

  

  * 
  Bull. 
  Soc. 
  Geol. 
  France, 
  2 
  e 
  serie, 
  vol. 
  xviii. 
  p. 
  261. 
  

   t 
  J. 
  Hall, 
  Amer. 
  Journ. 
  Science, 
  2nd 
  series, 
  vol. 
  xxxiii. 
  p. 
  294. 
  

   ■J 
  Ibid. 
  vol. 
  xxxvii. 
  p. 
  189. 
  § 
  M'Clintock's 
  ' 
  Voyage/ 
  &c, 
  Appendix. 
  

  

  || 
  Quart. 
  Joum. 
  Geol. 
  Soc. 
  vol. 
  ix. 
  p. 
  lxx. 
  

  

  1 
  Mem. 
  Geol. 
  Surv. 
  South 
  Staffordshire 
  Coal-field, 
  2nd 
  edit. 
  p. 
  180. 
  

   ** 
  Quart. 
  Journ. 
  Geol. 
  Soc. 
  vol. 
  xii. 
  p. 
  53. 
  

   tt 
  Murchison, 
  &c, 
  ' 
  Geol. 
  of 
  Eussia,' 
  vol. 
  i. 
  p. 
  409. 
  

  

  XX 
  The 
  following 
  are 
  a 
  few 
  instances 
  of 
  Carboniferous 
  rocks 
  in 
  contact 
  with 
  

   Silurian 
  or 
  other 
  very 
  ancient 
  formations 
  : 
  — 
  

   Barrande, 
  Bull. 
  Soc. 
  Geol. 
  France, 
  2 
  e 
  serie, 
  vol. 
  xi. 
  p. 
  311, 
  &c. 
  Bohemia: 
  on 
  

  

  Azoic 
  Rocks. 
  

   Murchison 
  and 
  Morris, 
  Quart. 
  Journ. 
  Geol. 
  Soc. 
  vol. 
  xi. 
  pp. 
  417, 
  427. 
  Thiiringer- 
  

  

  wald 
  and 
  Saxony 
  : 
  on 
  Gneiss. 
  

   Griiner, 
  Bull. 
  Soc. 
  Geol. 
  France, 
  2 
  e 
  serie, 
  vol. 
  xvi. 
  p. 
  414. 
  Departement 
  de 
  la 
  

  

  Loire 
  : 
  on 
  old 
  Metamorphic 
  rocks. 
  

   Murchison, 
  Geol. 
  of 
  Russia, 
  vol. 
  i. 
  p. 
  22. 
  In 
  the 
  Donetz 
  (11,000 
  square 
  miles) 
  : 
  

  

  on 
  very 
  ancient 
  Crystalline 
  rocks. 
  

   Ramsay, 
  Lecture, 
  Roy. 
  Instit. 
  Lond. 
  1858. 
  On 
  the 
  Longmynd. 
  

   Nicol,Quart. 
  Journ. 
  Geol. 
  Soc.vol.vi. 
  p. 
  58. 
  On 
  Lower 
  Silurian 
  in 
  South 
  of 
  Scotland. 
  

   Fournet, 
  Bull. 
  Soc. 
  Geol. 
  France, 
  2 
  e 
  serie, 
  vol. 
  i. 
  p. 
  785, 
  and 
  vol. 
  vi. 
  p. 
  626. 
  Near 
  

  

  Roannes. 
  

   Tract 
  on 
  Mississippi 
  Carboniferous 
  Limestone. 
  James 
  Hall. 
  On 
  Laurentian 
  

  

  and 
  on 
  Trenton 
  Limestone, 
  North 
  Illinois. 
  

   Tuomy, 
  Report 
  on 
  GeoJogy 
  of 
  Alabama, 
  pp. 
  8, 
  11, 
  20, 
  26, 
  &c. 
  On 
  Lower 
  Si- 
  

   lurian 
  ; 
  very 
  extensively. 
  

   Henwood, 
  Trans. 
  Roy. 
  Soc. 
  Cornwall, 
  1840. 
  Nova 
  Scotia 
  : 
  on 
  Granite. 
  

   Shumard, 
  Geol. 
  Surv. 
  Missouri, 
  1855. 
  On 
  Trenton 
  Limestone, 
  at 
  Sulphur 
  

  

  Spring 
  and 
  Salt 
  Creek, 
  Upper 
  Mississippi. 
  

   H. 
  D. 
  Rogers, 
  see 
  Dana's 
  ' 
  Manual,' 
  p. 
  228. 
  Upper 
  Silurian 
  of 
  Kittatinny 
  Moun- 
  

   tain 
  lies 
  unconformably 
  on 
  Lower 
  Silurian. 
  

  

  